The river smells terrible. People must _...

The river smells terrible. People must _____ dirty things into it.

A. be stopped to throw

B. be stopped from throwing

C. stop to throw

B 【解析】试题分析：句意：河流闻起来很糟糕。人们必须被禁止往河里倒脏东西。此题考查含有情态动词的被动语态，情态动词+be+动词的过去分词。根据句意，应选B。考点：考查情态动词的被动语态。

考点分析：

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